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United States Patent | 6,218,800 |
Akkermans ,   et al. | April 17, 2001 |
A control system in accordance with the invention comprises error signal generating means for generating an error signal in response to a reference signal and a first and a second position signal. The reference signal is a measure of the desired value of a position of a first part of a drive system with respect to a second part of the drive system. The position signals are a measure of the actual value of said position. The error signal is a measure of the difference between the desired value and the actual value of the position. The control system further comprises energizing means for energizing a motor which is to be controlled by the control system in dependence on the error signal. The control system of the invention is characterized in that the error signal generating means are adapted to generate weighting factors from the reference signal, for weighting the position signals with the weighting factors and determining a sum of the weighted position signals. The control system can be used in a recording/playback device for positioning a read/write head.
Inventors: | Akkermans; Antonius H. M. (Eindhoven, NL); Hezemans; Cornelius A. (Eindhoven, NL) |
Assignee: | U.S. Philips Corporation (New York, NY) |
Appl. No.: | 357271 |
Filed: | July 20, 1999 |
Jul 21, 1998[EP] | 98202445 |
Current U.S. Class: | 318/560; 318/561; 318/600; 318/601; 318/632 |
Intern'l Class: | G08J 011/01 |
Field of Search: | 318/560,561,569,600,601,615,616,632 |
4330880 | May., 1982 | Van Dijk | 369/32. |
5321676 | Jun., 1994 | Van Velthoven et al. | 369/32. |
5636193 | Jun., 1997 | Ohmi | 369/53. |
Foreign Patent Documents | |||
0508522A2 | Oct., 1992 | EP. | |
WO/9723873 | Jul., 1997 | WO. | |
WO97/23873 | Jul., 1997 | WO. |